Looper mechanism for sewing-machines.



Patented Mar. 23, 1915.

APPLICATION FILED 0GT.-3, 1913.

THE NORRIS PETERS CO., PHDTD-LITHU L E JOHNSON & E ERIGKSON LOOPEE MECHANISM FOR SEWING MACHINES.

LAWRENCE E. JOHNSON, OF WIN'IHROTP, AND EDWARD ERICKSGN, 0F LYNN, MASSA- GHUSETTS, ASSIGNORS '10 VICTOR SHOE MACHINERY G0,, 0F BOSTON, MASSACHU $E'ITS, A GORPQBAIION 0F MAS$AOHUSIETTS.

LOOPEZR MECHANISM FOR, SEWING-MACHINES.

Original application filed May 19, 1913, Serial No. 768,671.

To all whom it may concern Be it known that we, LAWRENCE E. JoI-IN- soN, a citizen of the United States of America, and a resident of Winthrop, in the county of Suffolk and State of Massachusetts, and EDWARD Enronson, a subject of the King of Sweden, and a resident of Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in LOOPGI Mechanisms for Sewing-Machines, of which the following is a specification.

This invention relates to improvements in loopers for shoe sewing machines and in the mechanisms for operating the same, the ob ject ofthe invention being to produce a more effective mechanism and at the same time simplify the construction of these devices by reducing the number of parts to a minimum.

The invention consists in certain novel features of construction and arrangement of parts which will be fully understood by reference to the description of the parts and to the claims hereinafter given.

Of the drawings: Figure 1 represents a vertical section of a sewing machine embodying the principles of the present invention, and Fig. 2 represents a plan of the rear end of the looper support and showing in section a portion of the cam for operating the looper.

Similar characters designate like parts throughout the several figures of the draw- 1n s.

Tn the drawings, 20 is the base of the machine aclapted to be secured to a column and having the usual end frames 21 supporting a revoluble shaft 23. The shaft 23 is revolved in any well-known manner and has a cam disk 26 keyed thereto, between the side frames 21. To the inner side of one of the side frames 21 is secured the work support 28 which may be of any well-known construction. This side frame 21 has also formed upon its inner face a race 30 for the shuttle 31 which is driven in any wellknown manner.

The machine is provided with the usual needle 8 1 and awl 911 together with mechanism for operating the same, all as shown and described in another application of ours Specification of Letters Patent.

Patented Mar. 23, 1915. Divided and. this application filed October 3,

Eerie]. No. 793,473.

filed May 19, 1913, Serial No. 768,671, of which this application is a division. The thread 6 passes from a sheave 124 on the takeup lever 125 to the eye 12b in the looper member 127 secured to a forwardly and upwardly extending socket 127 formed integral with the forked member 128*, the downwardly extending arms 129 of which straddle and are pivoted to the squared end 130 of an oscillating member 131*. This member 131 has a bearing in the end frame 21 and to its outer end is secured an arm 132 between the outer end of which and an eye 133 in the base 20 is interposed a spring 13 1. The rearwardly extending arm 135 of the member 128 is provided with a roller 136 positioned in the cam path 137 in the periphery of the disk 26 and other rollers 138 held in contact with the' periphery of the disk 26 by the spring 1341. The periphcry of the disk '26 is provided with a throw 139 adapted in the rotation of said disk to oscillate said member 130 131 about its axis while the throw 140 in the cam path 137 is rocking the member 128 about the axis of the pivot pin 1&1, the combined action of these throws forming the necessary loop around the hook of the needle 84: after it has passed through the work and is extending through the slot of the work support 28.

Owing to the pivotal connection of the looper support 128 whereby it may be tilted in either direction by the cams 139 and 110, the looper 126 will have imparted to it an orbital movement in a path encircling that in which the needle 84 moves, the cams 139-140 being so constructed and timed that this movement will occur when the needle has passed through the work and lies within the orbit of the looper. This makes a very simple construction of looper mechanism which is very effective in operation.

It is believed that the operation and many advantages of this sewing machine will be fully understood from the foregoing description.

Having thus described our invention, we claim:

1. In a shoe-sewing machine, the combi nation with a looper, of a bifurcated support therefor provided with a rearwardly extending arm; rollers mounted on said arm perpendicular to each other; an oscillating member having a flattened end positioned in said bifurcated support and connected thereto by a pivot pin perpendicular to the axis of said oscillating member; cam members coasting with said rollers for simultaneously moving said support about its pivot and said oscillating member about its axis; a lever on said oscillating member; a spring coacting therewith; and means for securing said lever to said oscillating member in adjusted position to vary the tension of said spring.

2'. In a shoessewing machine, the combination of an oscillating member having a flattened head; a bifurcated member straddling said head and provided with a rearwardly extending arin and a forwardly extending socket in a plane perpendicular to the axis of rotation of said oscillating member; a looper positioned in said socket; a pivot pin connecting said oscillating memher and bifurcated member perpendicular to the'axis of the former; rollers on the rear and side faces of said arm; and a revoluble member havinga cam path and peripheral cam throws coacting with said rollers and revoluble about an axis parallel with the axis of said oscillating member.

3; In a shoe-sewing machine; the combination .of an oscillating member having a flattened head; a bifurcated member straddling said head and provided with a rearwardly extending armand a forwardly extending socket, said arm and socket being inclined upwardly from said head and in a plane perpendicular to the axis of said oscillating member; a looper positioned in said socket; a pivot pin connecting said oscillating member and bifurcated member perpendicular to the axis of the former; rollers on the rear and side faces of said arm; and a revoluble member having a cam path and peripheral cam throws coac'ting with said rollers; resilient means for retaining said rollers in operative position relative to said revoluble member; and means for regulating the tension of said resilient means.

4. In a shoe-sewing machine, the combination of an oscillating member having a flattened head and a cylindrical shank positioned in a horizontal bearing in the frame; a bifurcated member straddling said head and provided with a rearwardly extending arm and a forwardly extending socket; a looper positioned in said socket; a pivot pin connecting said oscillating member and bifurcated member perpendicular to the axis of the former; rollers on the rear and side faces of said arm; a revoluble member having a cam path and peripheral cam throws coacting with said rollers; a lever clamped to the outer end of said shank; and a spring coacting therewith to retain the side rollers in contact with the periphery of said revoluble cam member.

-5. In a shoe-sewing machine, the combination of an oscilli ting member having a cylindrical shank positioned in a bearing in the frame of the machine; a member pivoted to one end of said oscillating member by a pinperpendicular to the axis of said shank and provided with a rearivardly extending arm and a forwardly extending socket; a looper positioned in said socket; rollers mounted on said arm perpendicular to each other; a member having a cam path and peripheral cam throws coacting with said rollers and revoluble about an axis parallel with the axis of said shank; a lever on the outer end of said shank; a spring coacting therewith; and means for securing said lever to said shank in adjusted positions to vary the tension of said spring.

Signed by us at Boston, Mass, this 2nd day of October, 1918.

LAWRENCE E. JOHNSON. EDWARD ERICKS'ON. Witnesses:

NATHAN C. LOMBARD; WALTER E. LOMBARD.

Copies 0T this patent may be obtained for-five cents each, by addressing the Commissioner of Patents. Washington, D. Q. 

